Table 2.

Detailed age distribution of whole sample population and positive pertussis cases as serodiagnosed in 1990, 1995, and 2002 to 2009a

Age group (yr)1990199520022003200420052006200720082009
No. of patients (8.11b)No. positive (9.95)No. of patients (11.43)No. positive (14.04)No. of patients (23.4)No. positive (17.0)No. of patients (26.1)No. positive (23.74)No. of patients (29.3)No. positive (23.6)No. of patients (33.85)No. positive (29.57)No. of patients (32.54)No. positive (30.64)No. of patients (35.42)No. positive (36.03)No. of patients (37.4)No. positive (36.67)No. of patients (36.7)No. positive (33.9)
Unknown33762161140322321131120190160
0–417329145241731112272351717251526148215531202
5–960234121598541113044716552693524540
10–14291618861116112842113434138341421599118910
15–19209823011945067215741011091251812019
20–241110150182365433395644727613
25–2940112212170424532497665663676
30–347184333275648891072689210521064
35–39107530333410213106894181133123910910
40–4474104321322988117141001113014125913914
45–49103131129282687387912481261011711
50–541031191263574757625102110341014
55–590020172101451836764106512981184
60–6421412001615046134637429911772
65–693000160141303494376533685403
70–74000090151346362271395450371
>751040110141332492302544674591
Total343912717559345521571,2041541,3291251,1511301,495851,5781081,43094
  • a Age groups with highest prevalence and total numbers of positive cases are indicated in boldface.

  • b Mean age in years is shown in parentheses.